Evidence in the book lessons before dying which supports the claim that Jefferson thinks he is not a man is found in the 11th chapter.
This is a body of information which indicates whether a belief is true and supports a proposition. It is a sign which shows that something exists.
In this chapter, Jefferson has internalized the white's sense of his own worthlessness, and so sees himself as worthless when Grant says he's going to return to Emma and tell her that Jefferson behaved like a hog, this sense of worthlessness makes him think he is not a man.
Hence, the evidence that supports that Jefferson thinks he is not a man can be found in chapter 11 of the book.
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